Harrow



(No Model.)

' P. RANDALL;

HARROW.

Patented Dec; 23, 1884..

171 yen z o 21 M lness es This feature is not here shown.

UN TED TATES ATENT Crricn.

FRANCIS \V. RANDALL, OF TEKONSHA, ASSIGNOR TO NEHEMIAH CHASE, FRED R.TAYLOR, MARSHALL B. SHAW, AND FRANK J. HENRY, OF

KALAMAZOO, MICHIGAN.

HARROW.

SPECIFICATION forming part of Letters Patent No. 309,800, dated December23, 1884-.

(No model.)

T 0 (ZZZ whom it may concern.-

Be it known that I, FRANCIS W.-RAN1).ILL, a citizen of the UnitedStates, residing at Tekonsha, State of Michigan, have invented a new anduseful Harrow, of which the follow ing is a specification.

This invention has for its object certain llllprovements in that classof harrows in which the teeth or shares are combined with shareactuatingsprings. Y

In the drawings forming a part of this specification, Figure 1 is a sideelevation of a tooth, tooth-holder. and spring. Fig. 2 isa sideelevation in which the tooth is broken away, showing a change in thetOOlZl'l-llOlClQl, Fig. 3, a broken view of the spring in en largedperspective. Figs. 4. and 5 are details in enlarged perspective, andFig. 6 is a horizontal broken section intercepting the bolt a, said boltbeing left full.

The coil-spring B is secured in a seat on the upper side of the beam A,the inner end of the coil being located above said point of securing,and the outer end of the coil in the roar of the coil.

1) is a tooth-holder having a central opening, Fig. 4, through which thecoil passes in its upward curve after leaving'its seat. The inner end ofthe coil is secured to the forward end of the tooth-holder D at c. Thetooth P is bolted to the other end of the holder D by bolt a. The outerend of the coil is bolted to an upward extension, 0, of thetooth-holder, or it may be extended and secured by the same bolt, a,which secures the tooth, Fig. 1.

On the under side of the rear end of the tooth-holder D is a concavity,71, into which the tooth is forced by tightening the bolt a, to form asecure connection. The disconnected portion of the tooth is designed tobe made non-elastic by striking it in from the rear side. The spring,where it is secured in its seat, is provided with a nipple, a, Fig. 3,and the convex side of the clip 26 has a series of concave recesses,

1', into which the nipple a enters to form a secure and adjustableconnection. By means of this simple construction a better spring actionis secured, and henceless danger of breaking the spring, and less springmetal is.required to attain the desired result. It will be observed thata backward strain upon the tooth. acts upon the entire disconnectedportion of the spring, and that said action coils the inner portion ofthe spring and uncoils the outer portion. The inner portion of thespring, being stiffer than the outer portion, does not unduly yieldunder the strain of the draft-power in drawing the harrow forward, andyet yields suffieiently in conjunction with the freer action of theouter end to impart to the tooth a proper vertical play.

I am aware that prior to' my invention curved springs and tooth-holdersof different styles have been connected together, and the holdersconnected with barrow-teeth in a manner to produce elastic effects inthe soil and different actions of the springs; but, so far as I. know, Iam the first to construct and com bine a spring, tooth-holder, and toothin a manner to effect the .results produced by my invention, ashereinbefore described.

' Having thus described my invention, whatI claim as new is In a harrow,the combination of the tooth, circularly-coiled spring, and thetooth-holder described, the latter having its forward end beyond itscentral opening secured to the inner end of the coil, and its rear endsecured to the other end of the coil and to the harrowtooth, whereby themovement of the tooth acts upon the spring, in the manner set forth.

In testimony of the foregoing I have hereunto subscribed my name in thepresence of two witnesses.

FRANCIS w. RANDALL.

Witnesses:

G. O. THOMPSON, G120. D. B. HALL.

